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While a good vet always checks hearts every time your dog goes in (mine does), you need to see a vet cardiologist for testing. You should contact the Northern breed club secretary to see if they know who does this; generally it is a vet school. Most people suggest getting a first cardiac exam done after 2 years old. Because heart disease is progressive, young cavaliers rarely have murmurs. Probably around 2 or 3 is good for a first test for a pet cavalier.